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HOW TO CHECK THE PAPER DEFECTS THAT ARE PRONE TO APPEAR IN THE PAPER MACHINE FABRIC
January 12,2021 By Changda Textile Views:
The key part of the wet paper forming in the fabric is also the root of many paper defects. Common paper defects iof the fabric mainly include the following aspects.
1、Slurry at the fabric: Pulp at the fabric edge is one of the main causes of paper defects. When it is light, it will cause paper holes or cracks at the edge of the paper. When it is heavy, it will cause paper breaks . Slurry at the fabric part is generally caused by the unclean edges of the core layer (fabric width top fabric>core fabric>surface fabric>bottom fabric). The unclean edges of the core layer may be due to poor adjustment of the flushing water. It may be due to the fluctuation of the liquid level in the white water tank outside the machine and the movement of the forming fabric. Slurry is sometimes thrown at the leading-out corners of the top fabric and core fabric. That is because the pulp at the edge of the fabric has accumulated too much，in the copy of high basis weight paper to pay special attention to.
2、Water needle: It can be said that the water needle is a key to the paper machine, and you must be very careful in its maintenance. First of all, the pressure of the water needle should be appropriate. If it is too large, it will splash, and if it is too small, there will be a danger of continuous cutting. Pay attention to the changes in the pressure of the water needle during the process of this paper, and pull the water needle to adjust the width slowly and steadily.
3、High-pressure water in the fabric part: the high-pressure water in the fabric part is responsible for cleaning. If the high-pressure water is blocked, the forming fabric is in danger of being blocked by fine fibers and resin, and the dewatering of the fabric part is not smooth, causing the curtain paper defect (white strips).
4、Spray starch tube: The paper diseases that spray starch tube are easy to produce are: starch spots, small bright spots (because the pressure of spraying starch is too large), sometimes the pressure of spraying starch is too small and the starch does not become misty but appears Drop-like, which will also cause continuous starch dripping on the paper.
5、Adjustment of the vacuum of the fabric: Pay attention to the vacuum adjustment of the wet suction box for the vacuum of the fabric, and ensure the backflow of the white water in the pool under the fabric. When adjusting the vacuum, pay attention to the change of the position of the water line, and ensure the vacuum degree of the paper web transfer vacuum box, otherwise the paper sheet will not peel off badly and the pulp will appear. There are many factors that cause paper defects in the fabric. The rot on the frame and the accumulated pulp, especially on the panel of the suction box, can also cause paper defects after entering the fabric.
1、Slurry at the fabric: Pulp at the fabric edge is one of the main causes of paper defects. When it is light, it will cause paper holes or cracks at the edge of the paper. When it is heavy, it will cause paper breaks . Slurry at the fabric part is generally caused by the unclean edges of the core layer (fabric width top fabric>core fabric>surface fabric>bottom fabric). The unclean edges of the core layer may be due to poor adjustment of the flushing water. It may be due to the fluctuation of the liquid level in the white water tank outside the machine and the movement of the forming fabric. Slurry is sometimes thrown at the leading-out corners of the top fabric and core fabric. That is because the pulp at the edge of the fabric has accumulated too much，in the copy of high basis weight paper to pay special attention to.
2、Water needle: It can be said that the water needle is a key to the paper machine, and you must be very careful in its maintenance. First of all, the pressure of the water needle should be appropriate. If it is too large, it will splash, and if it is too small, there will be a danger of continuous cutting. Pay attention to the changes in the pressure of the water needle during the process of this paper, and pull the water needle to adjust the width slowly and steadily.
3、High-pressure water in the fabric part: the high-pressure water in the fabric part is responsible for cleaning. If the high-pressure water is blocked, the forming fabric is in danger of being blocked by fine fibers and resin, and the dewatering of the fabric part is not smooth, causing the curtain paper defect (white strips).
4、Spray starch tube: The paper diseases that spray starch tube are easy to produce are: starch spots, small bright spots (because the pressure of spraying starch is too large), sometimes the pressure of spraying starch is too small and the starch does not become misty but appears Drop-like, which will also cause continuous starch dripping on the paper.
5、Adjustment of the vacuum of the fabric: Pay attention to the vacuum adjustment of the wet suction box for the vacuum of the fabric, and ensure the backflow of the white water in the pool under the fabric. When adjusting the vacuum, pay attention to the change of the position of the water line, and ensure the vacuum degree of the paper web transfer vacuum box, otherwise the paper sheet will not peel off badly and the pulp will appear. There are many factors that cause paper defects in the fabric. The rot on the frame and the accumulated pulp, especially on the panel of the suction box, can also cause paper defects after entering the fabric.
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